The Modern Day Tiles Resource Pack is well worth the price given the rights attached to purchasing the set. It comes with sheets for A2 (although nearly empty), A3, A4, A5, B, C, and D. There are also sheets for doors (2 of them, actually), various styles of dumpsters because why not, and various traffic signals. There's also a Steam exclusive background if you're into that kind of thing.
What is not as nice about the pack is that it's fairly limited in what you can build with it, but that's okay. I strongly recommend editing the stylesheet with your other tiles. The Futuristic Tiles Resouce Pack and the DS+ Resource Pack contain many assets that are invaluable for creating a richer environment than what you can accomplish with just the pack. Since there's no A1 or E sheet and because D, A2, and A3 are not completely filled out (A2 is almost empty) this means that there's far more that you can fit into a tileset. It's not necessarily complete on its own, but it's a great resource if you're looking for more contemporary-looking assets.